Samuel Lewis, 44, of Beltsville, Md. has been charged with committing seven armed bank robberies between October 14, 2010 and September 2, 2011, according to Montgomery County Police.

Detectives continue to investigate whether the suspect is responsible for additional bank robberies in the county and across the D.C. area.

He is also suspected of committing additional bank robberies in Arlington and Alexandria.

Lewis was arrested on Sept. 16 in Prince George’s County.

During the investigation, police released bank surveillance photographs to the media. Many tips were received and one led to the identity of Lewis. The anonymous tipster in this case, who received a unique, identifying number when he/she called police, is eligible for an award of up

Lewis is being held on $1,000,000 bond. He is slated for a bond hearing on Monday, Sept. 19 in Rockville District Court.

The anonymous tipster, who received a unique, identifying number when he/she called police, is eligible for an award of as much as $2,500 offered though Crime Solvers of Montgomery County. Police urge the anonymous tipster to call Crime Solvers of Montgomery County toll-free at 1-866-411-TIPS (8477) or 240-773-TIPS (8477) and provide his/her unique number to receive information on how to obtain this reward.